Specifications

3
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ASSEMBLING AND TESTING THE ENGINE
3.11.2
The maximum loosening between the cylin-
der and the piston must be within the va-
lues given in the table below. To evaluate
the loosening, you must apply the differen-
ce between the diameter on the cylinder
and that on the piston at the height of X as
stipulated in the tables above. Should the
difference exceed those stipulated in the ta-
ble below, replace the piston with another
from the same category that is marked on
the piston crown.
Should the result exceed those stipulated,
replace the piston with another from the
same category that is marked on the piston
crown.
Verify that the cylinder is perfectly smooth.
Otherwise, replace the element.
The cylinder class is marked on the lower
part of the cylinder, on the side of the
exhaust manifold.
Verify that the coupling surface between the
cylinder and head is flat. This can be carri-
ed out by resting the surface of the cylinder
onto a smooth surface and verifying that the
gap does not exceed 0.05 mm when measu-
red with a caliper.
The same test is performed on the head,
where the cylinder and head are coupled.
Position of the class marking on the cylinder.
Cubic Capacity [cm³]
Loosening limit between the cylinder and piston (worn)
A B C D
125 0,06 0,07 0,07
200 0,07 0,07 0,07 0,07
250 0,07 0,07 0,07
290 0,06 0,06 0,06